She's not pulling that out of thin air. Many years ago, Tere O'Connor did a piece where the unhappy characters were the ones who did classical ballet. It's a shorthand for some choreographers for rigidity and closed-mindedness.

Years ago the music played in my gym included many repetitions of a song in which a ballet girl lost her boyfriend (a "skater boy") because her friends were snooty about his clothes and style. I just Googled the lyrics:

He wanted her, she'd never tellsecretly she wanted him as well,

but all of her friends stuck up their nosethey had a problem with his baggy clothes.

He was a skater boy, she said see ya later boyhe wasn't good enough for herShe had a pretty face, but her head was up in spaceshe needed to come back down to earth.

five years from now, she sits at homefeeding the babyshe's all alone

she turns on tvguess who she seesskater boy rockin' up MTV

[ ... ] now he's a super starslammin' on his guitardoes your pretty face see what he's worth?

sorry girl but you missed outwell tuff luck that boys mine now

[ ... ] too bad that you couldn't seethat man that boy could be

there is more than meets the eyeI see the soul that is inside.

Apparently ballet girls also stand accused of snobbism, superficiality, bad judgment, and willingness to submit to conventional social pressure. I love the punishment the lyricist has chosen: single mom stuck in the house with the baby, having to watch the world pass her by on tv. No suggestion that she might actually be dancing for a living, and loving it.

Me and Nureyev have flaming rows about whether it takes more talent and discipline to be a ballet dancer or a pop singer. He used to put me down a lot, but I think I've converted him. - Mick Jagger, 1972